2.6 Compare and contrast common network configuration concepts.

Question 1

Translates human-readable names
into computer-readable IP addresses– You only need to remember
www.ProfessorMesser.com.

Answer 1

DNS (Domain Name System)

Question 2

Host record that represents the mapping of a single device for an IPv4 address.

Answer 2

Address (A)

Question 3

Host record that represents the mapping of a single device to an IPv6 address mapping.

Answer 3

(AAAA) Address

Question 4

Determines the host name for the mail server - this isn’t an IP address; it’s a name. Allows others to contact your DNS server for name resolution.

Answer 4

Mail Exchanger

Question 5

Human-readable text information
–Useful public information
–Was originally designed for
informal information
* Can be used for verification purposes
–If you have access to the DNS,
then you must be the administrator
of the domain name
* Commonly used for email security
–External email servers validate
information from your DNS

Answer 5

Text (TXT) records

Question 6

Used to reduce spam which often contains attractive phishing emails.

Answer 6

Spam management

Question 7

Digitally sign a domain’s outgoing mail
–Validated by mail servers, not usually
seen by the end user. Verify the source of an email.

Answer 7

Domain Keys identified mail (DKIM)

Question 8

A list of all servers authorized to send emails
for this domain
–Prevent mail spoofing
–Mail servers perform a check to see if incoming mail
really did come from an authorized host

Answer 8

Sender Policy Framework (SPF protocol)

Question 9

Prevent unauthorized email use (spoofing)
–An extension of SPF and DKIM.

You decide what external email servers should do with emails that don’t validate through SPF or DKIM.

Answer 9

Domain-based Message Authentication,
Reporting, and Conformance (DMARC)

Question 10

Servers that one of the numbers it has and gives it to a client for a temporary amount of time.

Answer 10

DHCP leases

Question 11

Number of addresses in a range that the DHCP can assign to a client.

Answer 11

DHCP Scope

Question 11

Administratively configured. Available when you want the device to keep the same IP address all the time but you still want the address to participate in DHCP

Answer 11

DHCP reservation

Question 12

A group of devices in the same broadcast domain. Separated logically instead of physically

Answer 12

Virtual LAN (VLAN)

Question 13

Encrypted (private) data traversing a public network.

Answer 13

Virtual Private Network (VPN)